Refactor Candidate and Quiz entities, rename Correction to QuizCandidate, and update related workflows

This commit removes nullable Uuid properties for consistency, transitions the Correction entity to QuizCandidate with associated migrations, refactors queries and repositories, adjusts related routes and controllers to use the new entity, updates front-end assets for elimination workflows, and standardizes route requirements and naming conventions.

src/Controller/AbstractController.php

@@ -9,6 +9,9 @@ use Symfony\Bundle\FrameworkBundle\Controller\AbstractController as AbstractBase
 
 abstract class AbstractController extends AbstractBaseController
 {
+    protected const string SEASON_CODE_REGEX = '[A-Za-z\d]{5}';
+    protected const string CANDIDATE_HASH_REGEX = '[\w\-=]+';
+
     #[\Override]
     protected function addFlash(FlashType|string $type, mixed $message): void
     {